Qubit PDF Editor ("Qubit", "the app", "we", "us") is developed and published by QubitSofTech, a software development company based in India. Qubit is distributed worldwide through Google Play, and this policy applies to every user of the app wherever they live.
For the purposes of the EU and UK General Data Protection Regulation, we are the data controller for the (very limited) processing described here. Google acts as an independent controller for the advertising data it collects through its own SDK — see section 5.1.
This policy is written to be accurate about this specific app, not a generic template. The same policy, in shorter form, is shown inside the app under Settings → Legal → Privacy policy. If you disagree with anything here, please stop using the app and uninstall it.
Your documents never leave your device. Opening, reading, searching, annotating, filling forms, signing, editing text, tables and pictures, adding headers and footers, recognising the text on scans, compressing, converting between formats and saving all run on your phone. Nothing you open is uploaded to us or to anyone else. There is no account, no sign-in and no server of ours.
The one part of the app that talks to the internet is advertising, served by Google AdMob, and it never sees your documents.
Where the law requires it — in the European Economic Area, the United Kingdom, Switzerland and regulated US states — the app asks for your advertising consent before any ad is requested, and lets you change your mind at any time.
We collect nothing. Qubit has no sign-up, no login, no user profile and no analytics or crash-reporting SDK of any kind. We do not operate a server that receives your data, and we have no ability to see what you open or what you do with it.
Specifically, we do not collect, transmit or store on any server:
Every part of Qubit that touches a document runs on your device. Your original file is only ever opened for reading; the app never writes to it. While a document is open, Qubit keeps a private working copy in its own storage so the original is never at risk; edits are made to that copy and are written to a new file only when you choose where to save it. Qubit does not read, index or copy your documents for any purpose other than showing them to you and making the changes you ask for.
A document leaves Qubit in exactly two situations, both of which you initiate:
Nothing is shared or saved anywhere unless you ask for it, and Qubit never sends a document anywhere on its own.
Qubit is offline-first. The following is written to your device's private app storage and stays there:
| What | Where it is stored | Why |
|---|---|---|
| A working copy of each document while it is open | The app's private files directory | So your original file is never written to. Deleted when you close the document, or offered back to you if the app stopped unexpectedly |
| Recently opened documents — the file's location and name | Local key-value storage (Jetpack DataStore) | So the Home screen can reopen them. Only documents your device has granted the app lasting access to are listed; you can remove any entry or clear the list at any time |
| Your Edit Point balance and the list of documents you have unlocked | Local key-value storage | So a point you earned is not lost when the app restarts |
| Your settings — theme, dynamic colour, keep screen on, page fit, whether the introduction has been shown | Local key-value storage | To remember how you like the app configured |
| Activity counts — how many times per day you opened, annotated, edited, recognised, compressed, saved or shared a document, kept for 14 days | Local key-value storage | To draw the chart under Settings → Your activity. It records numbers only — never which documents, their names or their contents — and Clear activity erases it |
| Your advertising consent choice, where one was asked for | Stored by Google's User Messaging Platform SDK on your device | So the question is not asked again on every launch |
| A temporary copy of a document you chose to share | The app's private cache directory | So the receiving app can read it. Cleared by the system, or when the app's cache is cleared |
Android's automatic backup may include the settings above in your device's Google-account backup if you have that feature enabled; it is a feature of your device, controlled by you in Android settings, and we receive nothing from it. Working copies of documents are excluded from backup. Everything above is removed when you uninstall the app.
Qubit makes network requests in exactly one situation: advertising. Everything else in the app — every reading, editing, recognition, compression and conversion feature — works fully offline, and the app needs no connection to do any of it.
Qubit is free and is funded by advertising served by Google AdMob using the Google Mobile Ads SDK. Ads appear in two forms:
To request, serve, measure and (where permitted) personalise ads, Google's SDK may collect and process information such as your device's advertising identifier, IP address, device and operating-system characteristics, approximate location derived from IP, and ad interaction data. This processing is carried out by Google as an independent third-party controller — the data goes to Google, not to us. We never receive your identifiers, and we receive only anonymous, aggregate revenue reporting from AdMob. The advertising SDK has no access to your documents.
Google's handling of this data is governed by:
Where your local law requires consent for advertising — currently the EEA, the UK, Switzerland and regulated US states — Qubit shows you Google's consent form before any ad is requested, using Google's User Messaging Platform. Until you have made a choice, no ad request is sent and the ad slot stays empty. Declining does not restrict any feature.
You can change or withdraw your choice at any time from Settings → Ad privacy settings. That entry appears in the app wherever a consent choice applies to you. Withdrawing consent takes effect immediately.
Device-level controls, available to everyone: you can reset or delete your advertising ID, or opt out of ad personalisation entirely, in Android Settings → Privacy → Ads (the exact path varies by manufacturer and Android version). You can also review your ad settings at myadcenter.google.com. Opting out does not remove ads; it makes them non-personalised.
Recognising the text on a scanned page uses a recognition model that ships inside the app (Google ML Kit's bundled Latin-script model). The page image is never sent anywhere, the feature works with no network connection at all, and the recognised words are written into your document and nowhere else. We chose the bundled model rather than the smaller downloadable one specifically so that this sentence stays true.
If you are in the EEA or the UK, the GDPR requires us to tell you the legal basis for each processing activity:
| Processing | Legal basis |
|---|---|
| Storing working copies, recent documents, settings, Edit Points and activity counts on your own device | Not our processing — the data never reaches us. Storage on your device is necessary to provide the service you requested (Art. 6(1)(b)) |
| Personalised advertising, and storing/accessing information on your device for advertising | Your consent (Art. 6(1)(a)), collected through the form described in section 5.2 and withdrawable at any time |
| Non-personalised advertising, where you decline consent | Google's own legal basis as controller; we rely on our legitimate interest in funding a free app (Art. 6(1)(f)) |
| Replying to a support email you send us | Performance of a request you initiated, and our legitimate interest in supporting our users (Art. 6(1)(b)/(f)) |
Withdrawing consent does not affect the lawfulness of processing carried out before you withdrew it.
Your documents and everything else the app stores stay on your device, wherever you are, and are never transferred anywhere by us.
Advertising data collected by Google may be processed on servers outside your country, including in the United States. Those transfers are made by Google under its own safeguards — including the EU Standard Contractual Clauses and, where applicable, the EU–US Data Privacy Framework. Details are in the Google Privacy Policy and Google Ads Data Processing Terms.
Because we hold no personal data about you, most rights below have an unusual answer when directed at us: there is nothing for us to produce, correct or erase. We say so plainly rather than pretending to a process we do not have. For advertising data, the holder is Google, and requests should be directed there — we will help you get to the right place.
You have the right to: access your data; have it rectified; have it erased; restrict or object to its processing; data portability; and to withdraw consent at any time (Settings → Ad privacy settings). You also have the right to lodge a complaint with your national supervisory authority — in the UK, the Information Commissioner's Office; in the EEA, your country's data protection authority, listed by the European Data Protection Board.
We do not carry out automated decision-making or profiling. Google's ad personalisation is described in Google's own policy.
We do not sell your personal information, and we do not share it for cross-context behavioural advertising. We receive none to sell.
However, when personalised ads are enabled, Google's collection and use of your advertising identifier may constitute a "sale" or "share" under the CCPA/CPRA and similar state laws. You can opt out in the app via Settings → Ad privacy settings, where that entry is shown to you, and on your device via Android Settings → Privacy → Ads → Delete advertising ID, which applies across all apps.
Subject to those laws you may also have the right to know what personal information is collected, to delete it, to correct it, to limit the use of sensitive personal information, and not to be discriminated against for exercising any of these rights. We do not offer financial incentives in exchange for personal information. We do not knowingly sell or share the personal information of anyone under 16.
Categories under the CCPA: the app itself collects no categories of personal information. Google's SDK may collect identifiers (advertising ID), internet or network activity (ad interactions), and coarse geolocation derived from IP address, for the business purpose of advertising.
As a Data Principal you may seek access to, correction of, and erasure of personal data processed by a Data Fiduciary, nominate another person to exercise your rights, and raise a grievance. We process no personal data about you, so we hold nothing to disclose, correct or erase. You may contact us at the address in section 13 with any grievance, and we will respond within the period the Act requires.
Users in Brazil (LGPD), Canada (PIPEDA), Australia (Privacy Act), South Korea, Japan, South Africa (POPIA) and elsewhere have broadly comparable rights of access, correction, deletion and complaint. The answer is the same: we hold nothing about you. Contact us and we will confirm that in writing and point you to Google for anything ad-related.
Email admin@qubitsoftech.com from any address, telling us what you want. We do not require you to create an account or verify an identity we never recorded. We will respond within 30 days, or sooner where the law requires. Exercising your rights is always free.
Qubit asks for no runtime permissions — nothing produces a prompt. It reads a document only when you pick it in the system file dialog, or when another app hands it over with "Open with" or Share, and only for as long as you have it open. It reads a picture only when you pick one to add to a page. Every permission the installed app declares is listed below, including those added automatically by Google's advertising SDK, because a list that only mentioned the ones we wrote ourselves would not match what you can inspect on your device.
Requested by the app itself:
INTERNET — to load advertising, and to open the web links listed above. No feature that touches your documents uses it.ACCESS_NETWORK_STATE — used by the advertising SDK to check whether a connection exists before requesting an ad.Added automatically by the Google Mobile Ads SDK, and used by Google for advertising, not by us:
com.google.android.gms.permission.AD_ID — allows access to your device's advertising ID. This is the permission behind the ad personalisation controls in section 5.2; deleting your advertising ID in Android settings stops it being usable.ACCESS_ADSERVICES_AD_ID, ACCESS_ADSERVICES_ATTRIBUTION, ACCESS_ADSERVICES_TOPICS — Android Privacy Sandbox APIs, used by Google's SDK for privacy-preserving ad measurement and topic selection.WAKE_LOCK, FOREGROUND_SERVICE — used internally by Google Play services components bundled with the ads SDK.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION — an app-private signing permission Android generates so the SDK's internal broadcast receivers are not exposed to other apps. It grants no access to anything of yours.Qubit requests no access to storage as a whole, camera, microphone, location, contacts, calendar, SMS, phone, body sensors or any other sensitive permission, and none of the permissions above lets us read anything from your device.
Qubit is a general-purpose productivity tool intended for a general audience aged 13 and over, and is declared as such on Google Play. It is not directed to children, and we do not knowingly collect personal information from children — we do not knowingly collect information from anyone, at any age. We comply with COPPA on that basis.
In the EEA and UK, the age of consent for online services is between 13 and 16 depending on the country. If you are below that age where you live, a parent or guardian must make any advertising consent choice for you. If you are a parent or guardian and believe a child has provided personal information to us (for example, by emailing us), contact us at the address in section 13 and we will delete it.
Because nothing is stored on our servers, you are in complete control:
There is no account to delete, because there is no account. We hold nothing to erase on your behalf.
Data stored on your device is kept until you delete it, clear the app's data, or uninstall the app; working copies are deleted as soon as you close a document. We retain nothing, because we receive nothing. Data processed by Google AdMob is retained according to Google's own retention policies.
Your documents and settings stay in Android's private per-app storage, protected by the operating system's app sandbox and by your device's own lock screen and encryption. The only file another app can ever be handed access to is the temporary copy of a document you chose to share, for as long as that share lasts. Because we never transmit or hold your documents, there is no server of ours that could be breached, and no dataset of ours that could appear in a breach notification. No method of electronic storage is perfectly secure, so please also keep your device itself protected and up to date.
Questions, concerns, privacy requests or grievances about Qubit:
Privacy requests, grievances and policy questions: admin@qubitsoftech.com
Help with the app: support@qubitsoftech.com
General and company correspondence: contact@qubitsoftech.com
Data controller: QubitSofTech, a software development company registered with the Government of India under Udyam Registration Number UDYAM-BR-11-0119074.
Registered office: 323, QubitSofTech, Pipra, Near Hanman Mandir, Areraj, East Champaran - 845419, Bihar, India.
We aim to respond within 30 days.
We may update this policy if the app changes — for example, if a future version adds a feature that touches the network. When we do, we will revise the "Last updated" date at the top and publish the new version at the same URL, and the copy inside the app will be updated with the app release that changes it. Material changes will also be noted in the app's Play Store release notes. Continuing to use the app after an update means you accept the revised policy. Previous versions are superseded on publication.